A low-temperature single-source route to an efficient broad-band cerium(iii) photocatalyst using a bimetallic polyoxotitanium cage

Abstract

Aqueous hydrolysis of a series of cerium-containing polyoxotitanium cages gives Ce(III)-doped TiO 2 [TiO 2 (Ce)] or TiO 2 -supported Ce(III) 2 Ti 2 O 7 , depending on the starting Ti : Ce ratio of the precursor. TiO 2 -supported Ce 2 Ti 2 O 7 exhibits superior photocatalytic activity to the Ce-doped TiO 2 materials and unusual broadband absorption behaviour across the visible and near-infrared regions.

Mo-doped TiO2photoanodes using [Ti4Mo2O8(OEt)10]2bimetallic oxo cages as a single source precursor

“…with M ¼ Co, Ni, and Mo), nuclearities, spatial arrangements, and functionalities via simple solvothermal methods and isolated by crystallization. [18][19][20][21][22][23] Some of these cages, also called clusters, have successfully been used as precursors for photocatalysts or electrocatalysts, for example using graphene oxide as a sacricial template or impregnating WO 3 photoanodes. 20,24 However, their wide adoption as single source precursors still requires nding facile and effective approaches that overcome their instability in water or humid environments.…”

Dipole‐Induced Band‐Gap Reduction in an Inorganic Cage

“…Although very few studies have attempted to elucidate the way in which metal ions are incorporated into titania, it is well known that the photoactivity of metal-doped titania depends substantially on both the metal ion and its concentration [4,5] and seems to be closely related to the structure and binding mode of the dopant metal ions within titania.Our interest in this area has focused on the exploration of a broad family of heterometallic polyoxotitanium (POT) cage compounds containing transition-metal and lanthanide ions, [Ti x O y (OR) z M n X m ] (M is a dopant metal ion, X an inorganic anion). [19][20][21][22][23][24] These molecular species can be regarded as models for the incorporation of metal ions into TiO 2 and are useful as organically-soluble single-source precursors for the stoichiometrically controllable deposition of metal-doped TiO 2 . [24] The cages are also of interest as organically soluble photocatalytic redox systems in organic synthesis.…”

In2S3 nanomaterial as a broadband spectrum photocatalyst to display significant activity

“…TiO 2 -supported Ce(III) 2 Ti 2 O 7 , produced by the aqueous hydrolysis of a cerium-containing polyoxotitanium cages, exhibits broad-band absorption behavior as a result of the combined effects of lowering the band gap, extending the absorption into the visible region, and potential up-conversion. Regrettably, its photoactivity under NIR radiation is very low [22]. Bi 2 WO 6 nanosheets with an orthorhombic structure and a growth direction of (0 0 1) plane possess good NIR photocatalytic degradation of methyl orange (MO) due to the oxygen vacancies of the Bi 2 WO 6 .…”